- 3.1 by 2.3 by 1.6 cm – Thumbnail specimen (fits into a 3 cm cube)
Manganosite is a simple manganese oxide mineral; despite its simple chemistry the mineral is rather rare. It alters to pyrochroite (manganese hydroxide) in the presence of water. Blomstrand (1874) named the mineral after its composition. The fresh mineral is bright green, but this example has darkened. The manganosite grains reach 3 mm in diameter and are surrounded by sooty pyrochroite in dolomite.
This specimen was part of the personal collection of Ralph Merrill, proprietor of the prolific mail order business Minerals Unlimited. He obtained the piece in 1949 from George Burnham. Merrill's collection card and label, and a Burminco label, also ship with the specimen.
Item code: MS0870
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